avaudioengine

I have an app that changes the pitch of the audio when the pitch button is selected, now i am using installTapOnBus to save the file but this method gets invocated after i press the pitch button therefore only part of the audio is saved, i want to save the whole audio no matter when the pitch button is selected, is there any way This method is used to play the audio -(void)playAudio { NSError *err = nil; audioEngine = [[AVAudioEngine alloc] init]; AudioFileplayer = [[AVAudioPlayerNode alloc] init]; pitch = [[AVAudioUnitTimePitch alloc] init]; reverb = [[AVAudioUnitReverb alloc] init];

I have an app in which I use AVAudioEngine for playing files from the local file system by using AVAudioPlayerNodes and AVAudioFiles . This works perfectly fine. Now I would like to enable my setup to also support streaming of MP3 files from a server on the internet. What I've tried so far My hope was that I could create some sort of buffers from NSURL objects pointing to network addresses, which I could then use with my AVAudioPlayerNode . I've searched Stack Overflow and the internet in general but haven't found any good tips on how to achieve this. I know that the AVAudioEngine lineup

I am implementing Speech Recognition in my app. When I first present the view controller with the speech recognition logic, everything works fine. However, when I try present the view controller again, I get the following crash: ERROR: [0x190bf000] >avae> AVAudioNode.mm:568: CreateRecordingTap: required condition is false: IsFormatSampleRateAndChannelCountValid(format) *** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: IsFormatSampleRateAndChannelCountValid(format)' Here is the code used for starting and stopping recording:

I'd like to record the some audio using AVAudioEngine and the users Microphone. I already have a working sample, but just can't figure out how to specify the format of the output that I want... My requirement would be that I need the AVAudioPCMBuffer as I speak which it currently does... Would I need to add a seperate node that does some transcoding? I can't find much documentation/samples on that problem... And I am also a noob when it comes to Audio-Stuff. I know that I want NSData containing PCM-16bit with a max sample-rate of 16000 (8000 would be better) Here's my working sample: private

I'm trying to generate a spectrogram from an AVAudioPCMBuffer in Swift. I install a tap on an AVAudioMixerNode and receive a callback with the audio buffer. I'd like to convert the signal in the buffer to a [Float:Float] dictionary where the key represents the frequency and the value represents the magnitude of the audio on the corresponding frequency. I tried using Apple's Accelerate framework but the results I get seem dubious. I'm sure it's just in the way I'm converting the signal. I looked at this blog post amongst other things for a reference. Here is what I have: self.audioEngine

I am trying to stream audio from the microphone to another iPhone via Apples Multipeer Connectivity framework. To do the audio capturing and playback I am using AVAudioEngine (much thanks to Rhythmic Fistman' s answer here ). I receive data from the microphone by installing a tap on the input, from this I am getting a AVAudioPCMBuffer which I then convert to an array of UInt8 which I then stream to the other phone. But when I am converting the array back to an AVAudioPCMBuffer I get an EXC_BAD_ACCESS exception with the compiler pointing to the method where I am converting the byte array to

Background - I saw a video titled "AVAudioEngine in Practice" from the following list of videos published at Apple's recent WWDC to apply sound effects to an audio. https://developer.apple.com/videos/wwdc/2014/ After that, I was successfully able to change the pitch of an audio with the following code: //Audio Engine is initialized in viewDidLoad() audioEngine = AVAudioEngine() //The following Action is called on clicking a button @IBAction func chipmunkPlayback(sender: UIButton) { var pitchPlayer = AVAudioPlayerNode() var timePitch = AVAudioUnitTimePitch() timePitch.pitch = 1000 audioEngine

I am working on an iOS app that uses AVAudioEngine for various things, including recording audio to a file, applying effects to that audio using audio units, and playing back the audio with the effect applied. I use a tap to also write the output to a file. When this is done it writes to the file in real time as the audio is playing back. Is it possible to set up an AVAudioEngine graph that reads from a file, processes the sound with an audio unit, and outputs to a file, but faster than real time (ie., as fast as the hardware can process it)? The use case for this would be to output a few